Rotary wood chipping machine



w. "l. BROWN ROTARY WOOD CHIPPING MACHINE June 11, 1935.

Filed Nov. 21, 1932 2 Sheets-Sheet 1 INVENTOR.

AHJSQS$J$ ATTORNEY June 11, 1935. w. 1. BROWN ROTARY WOOD CHIPPING MACHINE Filed Nov. 21, 1952 2 Sheets-Sheet 2 ATTORNEY Patented June 11, 1935 l L aoonasr r a p Ro'rARi; WooncHI PPING MkiCHiNE- v Walter-l. Brown, OaklandQCaIif. t T {Application November-i 21 mash-m1 No. 643,659, a

' fi'jClaiihsi (Cristi- 75):

- This invention relates Y to :rotary wood chipping r machines. i

*My copending application for a method of and a-2device'- forforming pulp chips; filed November 5.21; 1932,"Serial'No. 642,758 relates to a machine of thereciprocating type in which only one block canbe operated on at'a time-andwhich is very suitable for'small production- 1 My. present invention-has forits principal obo ject to provide a machine in which the number ofb'locks of-wood operated on by the machine may be-mad'e of any' desired number, andwfll produce large quantities of uniformand equal in alldimens'ions; No feathchips; V i

Where" non-uniform chips are placed in respective pulp solutions,rthe thinner portions of the chips and the smaller chips are completely acted on before the heavier chips have'had the reaction "completed, and -by the time the-heavier chips have been fully acted upon}! the smaller chi s andjthinner portions hav'le' become-formed int a gelatinous mass having-noutility inthe i manufacture of the particular product, but :instead being a hindrance to' the successful and emcient operationof the pulping unit.

I he tur-ther'object' of thisiinvention is to provide a rnachine for producing chips of uniform- I size with parallel faceslfrom pulp wood, in large; quantities, so that the chips produced "will he acted on 'by the pulpingsolutionssimultaneously audio-the: same degree, whereby losses are :obvia't'ed due' to the gelatinizing of smaller -orthin-;

I ner portions of chips.

Another object of the invention is topprovide ered edges orith'in portions are formed -on the a-machine" for forming equi-dimensional wood chips in large quantities, the machine being -ad justable to provide chips of desired thickness for r themost efiicient operatio'n of the pulping unit. A further object of the invention is to-provide amachineof theclass described which is of the:

rotarytypegandrin which a plurality of pulp wood blocks may be formed'into pulp =chips simultaneouslv by constant rotation of the machine.

Other objects and advantages of the invention will become apparent as the following descri'p tion is -read' on the drawings-forming a part of this specification and in which similarreference 7 characters are used to designate similar parts tliroug'hout' -the several views, of which: 7 i *iEig. 1 is a plan View of the rotary woodpulp machine. v

'Fig; 2"is asection taken on line j2 -2f ofFig. 1. Fig.--'3-is afragmentary plan view-s'ho'wingthepulp --chips"which are secured to: the upper end membersizll; a rotary cutter-wheel being rotat toretain the cutter-*wheel-at 'its rimagainstven slitting. and shearing units, the supporting" and I aligning means and the riders.- I a. t i 1;.Fig. 4 is a section taken onglinefl-d-fiof Fig. 3.- Fig.5 is a section takenion line 5-5 of Fig. 1.- I Figifi is asectionshowing a-sideelevation of l. one of the slitting cutters.

Figs? is a section taken on linefL-Tv of Fig. 6.

'l heinvention consists of a: frame having legs- Hhwhich are suitably braced at [I an'd' a central" standard t2 forming a' support for the bearing elementpcrossamembers i3 tying the legs in and central standard Zinto a, un'itto formthe frame.

The legs extend above the .crossmembers' l3, andhave mounted adjacentthe top, supporting- 'elexnents in the form of grooved wheels 4,fl5;" 7 these wheelshaving an angular groove formed about theperiphezw :and being provided with ad-' justing means consisting of an eccentric shaft" l5 theieccentric portion of which rotatably cooperates' with the wheel 14, the shaft: being secured-againstrotation by means ofa lever 'l6 of the shaft as indi cated inFig. 5, thisilever being provided with an arcuate slot t! for cooperation "with a boltorr screw "l8 secured fin the bracket i'9.- V Rigidly mounted on the top of the legs and transversely spanning theframeare cross mem bers twosets of cross members-being shown; although any number'may be provided, these, crossmembersforni-ing supports for the'hoppers aIIdjI'OI the cent'r'ail shaft bearing." i 'A bearing 2 l mounted on top 'o'f the centr standard "I2 and another bearing 22 L is mounted and suppoi'ted at the coincidence of the cross ably mounted 'betweenthe bearings 21 and '22, the central shaft 23 being vertically-disposed, so that the cutter wheel jrota-tes in a horizontal p1a ne }fv i i cutter-wheel consists of two concentric rings- 2 band 25- ofdifierent diameters supported byf' armsfizfiywhichiare integral with or fixedly se cured to-a -centra'l *hub -ZT; 'l'he outer'ring 24 0i periphery of the cutterwheel is fangularly formed complementary to the -grooved fwheel 154, thegroovein the wheel and theaperiphery of-ther'ing Z-Mb'e'i'ng 'formed divergentlvtoward the "axis of the cutter-wheel, cooperating in such manner as-' tical deflection; and thus permitting movement only in a circular direction in ahorizontal plane, theyproper alignment of thexcutter-wheel ibeing; very important-andfon' which purpose "the" ad-: justment of the-grooved wheels 1 4 is provided. Spanning thespace between the inn'en'ring' element 31 will shear off the slit portion as indicated at lli, this sheared ofi portion dropping 25 and outer ring 24 is a plurality of slitting and shearing units, consisting each of a bar or support 28 which is removably secured to the respective rings as indicated at 29, and which is provided with a plurality of slitting cutters 30, these slitting cutters being equally spaced in a direction radially from the axis of the shaft 23 and being spaced at a distance equal to the length of the wood chips to be produced.

These slitting cutters consist of a knife 31 having a sharp leading edge and top edge and being secured in plugs 32 as indicated at 33, the plugs being secured in suitable apertures 34 by means of set screws 35 whereby the height of the cutting edge above the surface 36 'may be adjusted. V a

It will be noted that these slitting elements are readily replaced or removed for sharpening, and

that the plates 28 may be provided with difierent spacing of the slitting elements so that the length of the chips may be varied as desired.

Mounted in follow relation to. the slitting elements is a shearing element or knife 31 having a flat top face 33 and a sharp front edge 39, and which is supported by the rings 24 and 25 at ,such a height that the top surface 38 is substantially in a plane parallel to the top cutting edge of the knives 3i, so that ,as the machine operates,.the slitting cutters 3| will slit transversely through the side ofga block of wood, and. the shearing into a suitable receptacle or chute (not;shown) Riders 4i, arcuately spanning the space between the shearing element, 3'! and the next following slitting element 28 are provided with uni-' form slope from the shearingelement 31 to the slitting element 28, to support the block of wood between these elements and permit gravitational feeding to the next following set of slitting knives, 1

thereby preventingany rebound in the block or shock to the machine.

Driving means for the rotary cutter-wheel consists of a'bevel gear 42, which is fixedly secured to'the underside of the cutter-wheel, and which has cooperating therewith a bevel pinion 43, which is fixed on a shaft 44, this shaft being rotatably mounted in bearings 45, the bearings being mountedona suitable base 46 on the transverse members l3. The pinion 43 is driven by means of a motor 47 and a plurality of these motors and drive pinions are preferably provided, to be equi-angularly spacedso as to obviate any tendency for distortion of the cutter-wheel and v to equalize the thrust, thusmaintaining the accuracyof the slitting cutters and preventing the breaking thereof.

Mounted on the cross ;members 20 in cooperative relation to the slitting and shearing units is a plurality of hoppers 43, of rectangular form, to slidably receive woodin the form of blocks as indicated at 49, to permit the block to gravitationally feed to the slitting knives 3i and shear ing knife 37-, thesehoppers being so formed as to prevent horizontal movement of the block whilethe slitting cutters are slitting the side of the block, while still permitting the downward movement. V 7

The number of slitting and shearing units is made different than the number of hoppers and should preferably vary by one, whereby the slittingand shearing units are successively brought into cooperation with the block of wood and thus distributing the power during operation of the machine.

The machine shown in the drawings is provided with four hoppers and five slitting and shearing units. However, this number may be increased as desired.

The operation of themachine is as follows:

The pulp wood is cut into rectangular blocks nearly equal in length to the radial lengths of the hoppers and of a thickness nearly equal to the transverse width of the hoppers, the height of the block being inconsequential. The cutter-wheel or rotor is driven by means of the motors through the pinion 43 and bevel gear 42, the slitting knives '30 first cooperating with the block of wood and cutting a series of transverse slits across the bottom of the block, the shearing knife 38 next cooperating with the block and shearing off the slitted portion, providing a plurality of chips of equal thickness and equal length, the chips falling away through the opening provided between the shearing cutter 38 and the mounting block 28. Referring to Fig. 1, it will be noted that the slitting and shearing unit 53 has just completed the operation of the block 5|, that theslitting. and shearing element kills in cooperation with the block '53, and that after it passes out of cooperation and has completed theoperation, the slitting and shearing element 54 will cooperate with the block 55, the operation of the various units being successive, thereby equalizing the load during the operationof the machine.

Having described an operative rotary machine; for forming equi-dimensional pulp chips, it will. be understood that variations in construction and arrangement of parts which are consistent with the appended claims may be resorted to without detracting from the spirit or scope of the inventionor sacrificing any of the advantages thereof. V a a I claim:

1. A wood chipping machine comprising a sup porting frame, a cutter wheel rotatively supported by said frame, said concentrically disposed ring-like members, means on said cutter wheel for supporting a series of slitting cutters arranged in a radial line with respect to the axis of rotation of the cutter wheel, support arms carried by the cutter wheel and ar ranged concentrically with respect to. said ringlike members, a shearing knife mounted on the a seriesof slitting cutters arranged radially on said cutter wheel, a blade supporting devicearranged concentrically with respect to said cutter wheel, a radially disposed shearing bladecarried by the blade-supporting device in a position adjacent saidslitting cutters, and means for feeding a block of wood to said blade and cutters.

3. A wood chipping machine comprising a supporting frame, a cutter wheel rotatively sup-' ported by said frame, said wheel consisting of concentrically disposed ring-like members, means;

for rotating said wheel, one or moreradially disposed support bars secured to'said ring-like members, a plurality of slitting cutters carried by each support bar and arranged radially with respect to said-wheel, one or more radially disposed shearing knives carried by thesupport bars, there becutter wheel consisting of;

ing one shearing knife for each support bar, the cutting edge of said knife lying adjacent to the slitting cutters of an adjacent support bar, and means normally fixed withrespect to said cutter wheel for feeding wood to said knife and slitting cutters.

4. A -wood chipping machine comprising a supa cutter wheel, means carried by porting frame,

said frame for rotatively supporting said cutter wheel, said cutter'wheel consisting of concentrically disposed ring-like members, aradially dis posed support bar carried by the cutter wheel, a plurality of slitting cutters carried by the support bar and arranged radially with respectto the cutter wheel, arcuate arms secured to said cutter wheel and arranged concentrically with respect to said ring-like members, a shearing knife carried by said arcuate arms ina radial position adjacent to said slitting cutters, means for rotating said cutter wheel, and means for feeding wood to, the

shearing knife and slitting cutters.

5. A wood chipping machine comprising a supporting frame, a cutter wheel consisting of a pair of fixedly related concentric rings, means carried by the frame for supporting said wheel, means for rotating said wheel, a plurality of radially dis? posed support bars carried by said ring-like mem-.

bers in radial positions, a plurality of slitting cut: ters carried by eachsupport bar, and arranged radially with respect to said wheel, means for ad- 1 "with feeding wood to the shearing knives and slitting V cutters. i 1 r l 6. A wood chipping machine comprising a supporting frame, a cutter wheel formed with two concentric ring-like members, eccentric shafts rotatively mounted in said frame, support wheels mounted on said shafts and engaging the periph ery of the cutter wheel in such manner as to rotatively support the same, means for rotatively adjusting said shafts so as to move the supporting wheelstoward and from the periphery of the cutter wheel, a series of slitting cutters supported by said ring-like members and arranged radially with respect to said cutter wheel, a blade supportjting device arranged concentrically with respect a radially arranged shearing blade carried by the supporting device to said ring-like members,

and arranged adjacent to but to the rear of the slitting cutters, and means for feeding wood to said blade and said cutters.

WALTER I. BROWN. 

